data type understanding of Parse database

Question

I am developing iOs application with back-end Parse, but I have some question regarding data-type in Parse.

There is 10 datatype in parse database

Now my questions are :

1. For foreign key I have to use Relation, then Pointer used for which purpose ?

2. GeoPoint used for which purpose ?

3. For latitude-longitude I have to select Which Data Type ?

4. For Image I have to use which data type ?

Answer 1

Go through the link your can find : https://parse.com/docs/ios/api/Classes/PFFile.html